While studying the dependence of potential difference (V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and I. He got a straight line graph passing through the origin. What does the straight line signify? Write the method of determining resistance of the resistor using this graph.



The graph between V and I is a straight line graph which passes through the origin.

Q1 - While studying the dependence - Teachoo.jpg

The straight line signifies that potential difference (V) is directly proportional to Current (I).

The slope of the straight line gives the resistance of the resistor.

Resistance or Slope = ( V 2 - V 1 ) / ( I 2 - I 1 )

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CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo